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This is a rather net version of the classic device used for locating hidden cameras in accommodation or other locations.

It relies on retro-reflection from optical systems to show their location and allow further investigation.

https://youtu.be/J5ctijPFLyY

Files

Inside a Temu spy camera detector - with schematic

Although this detector came from Temu (not a sponsor) it is widely available from many online sales platforms. Its purpose is to help you locate concealed cameras in your home or temporary accommodation. It does that by firing out a bright ring of red light, which you can then view centrally for retro-reflections from lenses. The use of a dichroic glass filter is unusual for something like this, and quite a nice touch. The circuitry is very simple, since the unit relies on the skills of the user to differentiate what might be causing a reflected pinpoint of light. It's intended for use by someone knowledgeable about what they are looking for and the areas a secret camera might be covering. If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:- https://www.bigclive.com/coffee.htm This also keeps the channel independent of YouTube's algorithm quirks, allowing it to be a bit more dangerous and naughty. #ElectronicsCreators

Comments

Jim Hewlett

I take it that this will detect cameras that are not turned on at the time.

bigclive

It will reflect off any typical optical system regardless of whether it is powered or not.

Dave Frederick

Interesting. I guess that could be kind of effective with the caveats you mentioned. I haven't heard dichroic filters mentioned since my early days in Television. I remember a dichroic filter was used in front of the prism that separated out the RGB tubes.